Vocab
organisms that are best adapted to an environment are more likely to survive and reproduce more than others
What is Natural Selection?
Why is genetic variation important for the survival of a population?
environment changes; the more variation within a species the more likely it survives
Behavioral isolation is
when 2 populations have different courtship behaviors and they will not interbreed. For example, they have different mating songs and different scents.
What represents the dominant and what represents the recessive allele in Hardy Weinberg?
p = Dominant and q = recessive
Darwin’s theory of natural selection says that
More offspring are produced than can possibly survive.
There is competition for resources among offspring.
There is variation among offspring.
change in allele frequency over time; process by which modern organisms have descended from ancient organisms (decent with modification)
What is Evolution?
What type of structure has a similar function but not a similar structure?
Analogous structures
Geographic isolation is
when a physical barrier separates the original population. Over time the 2 populations become genetically different and can't reproduce.
In Hardy Weinberg equilibrium, hat represents homozygous dominant and what represents homozygous recessive?
p2 - homozygous dominant genotype
q2 - homozygous recessive genotype
Organisms in the top layer of a fossil record indicate....
a group of organisms share common descent if they have a common ancestor
What type of structures have a different functions but are similar in structure.
Homologous structures
What does allopatric speciation mean?
Species that are geographically isolated into distinct species. EX: Galapagos finches
What represents homozygous in Hardy Weinberg?
2pq - heterozygous genotype
Homologous structures in different organisms indicate
common ancestry
a structure that an organism has that is no longer useful to it, but they have this structure because a common ancestor to that organism found it useful
What are vestigal structures?
What is an example of homologous structure?
whale dolphin fins and bat wings
What does sympatric speciation mean?
New species evolve from a single ancestral species while inhabiting the same geographic region. EX: apple maggot fly
If a recessive allele frequency is .25 then what would the heterozygous frequency be?
.38
the geological record of organisms on earth that have been preserved in the rock in a chronological order is called
fossil record
What are inherited characteristics that increase an organism’s chance of survival?
Adaptations
What's an example of a vestigal structure?
pelvic bones of whales, wings of flightless birds
What is the formation of a new species over time
Speciation
A population of rabbits may be white or brown. White is dominant and has the genotype of BB or Bb. Brown rabbits have the genotype bb. The frequency of the BB genotype is .35. What is the frequency of the B allele?
.59
Fitness or survival of the fittest is the
ability of an organism to survive and reproduce in its environment